Color spec
| Brand | Sherwin-Williams |
| Name | Sea Mariner |
| SKU | SW 9640 |
| Hex | #434A54 |
| RGB | 67, 74, 84 |
| HSL | 215°, 11%, 30% |
| LRV | 7 |
| Undertone | blue / cool |
| Family | Gray |
About Sherwin-Williams Sea Mariner
At LRV 7, Sea Mariner is about as dark as paint gets — it reads near-black on a wall and reveals its character only in direct daylight or under warm bulbs. Its blue undertone is the part to watch: it gets picked up by whatever sits next to it, so test it against your trim, floor and the room's main light before committing. In rooms with little natural light it can feel heavy, so reserve it for spaces you want to feel enveloping.
Sea Mariner earns its keep as a statement: accent walls, a front door, cabinetry, a moody powder room, or exterior trim where you want sharp contrast. Grays like this read as a modern neutral and sit comfortably alongside both warm woods and cool metals.
Closest matches at every US brand
13 brands · top 5 each5 closest matches per brand by ΔE2000, computed against each brand's full deck. Tap any swatch for its full single-color spec; tap the brand title to browse all gray from that brand.
Benjamin Moore
Dunn-Edwards
Behr
Valspar
Dutch Boy
PPG / Glidden
Magnolia Home
Farrow & Ball
C2 Paint
Diamond Vogel
Kompozit
Clare
Backdrop
Similar Sherwin-Williams colors
closest in the Sherwin-Williams deckThe nearest shades to Sea Mariner within Sherwin-Williams's own range, ranked by perceptual color distance — useful when you want the same look a touch lighter, darker, or warmer.
Coordinated palette
Generated by hue-rotating #434A54 in HSL space. Pair Sea Mariner with one accent and one neutral — the swatches below are starting points, not final picks.
Accessibility (WCAG contrast)
WCAG 2.1: AA = 4.5:1 normal text · AA Large = 3:1 large text · AAA = 7:1 normal text.
Sherwin-Williams Sea Mariner Equivalents at Other Brands
Matching Sea Mariner from a different paint counter? Below is the single closest color in each major US deck and how close it really is. Remember that any paint store can also custom-tint Sherwin-Williams SW 9640 directly — these equivalents are for when you'd rather stay inside one brand's own deck.
Benjamin Moore Equivalent of Sea Mariner
The closest Benjamin Moore equivalent of Sea Mariner is Hale Navy (HC-154). At ΔE 0.63 the two are indistinguishable on a wall — it carries the same cool blue undertone and sits at the same lightness (LRV 8 vs 7). If Benjamin Moore is your counter, order Hale Navy and you'll get the same color. See the full Hale Navy swatch →
Behr Equivalent of Sea Mariner
Behr's nearest match is Dark Night (PPF-58), visually identical in normal room light (ΔE 1.72). It sits at the same lightness (LRV 7 vs 7) and carries a cool blue undertone, so it substitutes for Sea Mariner without repainting risk. See the full Dark Night swatch →
Dunn-Edwards Equivalent of Sea Mariner
At Dunn-Edwards, the closest color to Sea Mariner is Seared Ash (DESS31) — very close at ΔE 2.6, though not an exact twin. It sits at the same lightness (LRV 7 vs 7) and carries a cool blue undertone; sample both side by side if the room gets strong natural light. See the full Seared Ash swatch →
Dutch Boy Equivalent of Sea Mariner
At Dutch Boy, the closest color to Sea Mariner is Navigation (432-7DB) — very close at ΔE 3.16, though not an exact twin. It sits at the same lightness (LRV 7 vs 7) and carries a cool blue undertone; sample both side by side if the room gets strong natural light. See the full Navigation swatch →
Farrow & Ball Equivalent of Sea Mariner
At Farrow & Ball, the closest color to Sea Mariner is Hague Blue (NO. 30) — very close at ΔE 3.33, though not an exact twin. It sits at the same lightness (LRV 7 vs 7) and carries a cool blue undertone; sample both side by side if the room gets strong natural light. See the full Hague Blue swatch →
Valspar Equivalent of Sea Mariner
Valspar has no exact twin of Sea Mariner. The nearest is Night View (4007-4C) at ΔE 3.58 — close, but the difference shows next to trim and in side light. It sits at the same lightness (LRV 6.6 vs 7). Compare large swatches before substituting. See the full Night View swatch →
C2 Paint Equivalent of Sea Mariner
C2 Paint has no exact twin of Sea Mariner. The nearest is Espionage (C2-742) at ΔE 3.63 — close, but the difference shows next to trim and in side light. It sits at the same lightness (LRV 6 vs 7). Compare large swatches before substituting. See the full Espionage swatch →
PPG / Glidden Equivalent of Sea Mariner
PPG / Glidden has no exact twin of Sea Mariner. The nearest is Black Forest (PPG1012-7) at ΔE 3.84 — close, but the difference shows next to trim and in side light. It sits at the same lightness (LRV 7 vs 7). Compare large swatches before substituting. See the full Black Forest swatch →
Diamond Vogel Equivalent of Sea Mariner
Diamond Vogel has no exact twin of Sea Mariner. The nearest is Octavius (0522) at ΔE 4.28 — close, but the difference shows next to trim and in side light. It sits at the same lightness (LRV 6 vs 7). Compare large swatches before substituting. See the full Octavius swatch →
Magnolia Home Equivalent of Sea Mariner
Magnolia Home has no exact twin of Sea Mariner. The nearest is Fine Black (JG-144) at ΔE 4.52 — close, but the difference shows next to trim and in side light. It sits at the same lightness (LRV 6 vs 7). Compare large swatches before substituting. See the full Fine Black swatch →
Backdrop Equivalent of Sea Mariner
Backdrop doesn't make a true equivalent of Sea Mariner — the nearest deck color, Last Call (BD-LC), is clearly different (ΔE 5.98). For an exact match, any Backdrop retailer can custom-tint Sherwin-Williams SW 9640 instead. See the full Last Call swatch →
Kompozit Equivalent of Sea Mariner
Kompozit doesn't make a true equivalent of Sea Mariner — the nearest deck color, Calm Interlude (0501), is clearly different (ΔE 6.76). For an exact match, any Kompozit retailer can custom-tint Sherwin-Williams SW 9640 instead. See the full Calm Interlude swatch →
Clare Equivalent of Sea Mariner
Clare doesn't make a true equivalent of Sea Mariner — the nearest deck color, Blackish (PNT100-DP-54), is clearly different (ΔE 7.45). For an exact match, any Clare retailer can custom-tint Sherwin-Williams SW 9640 instead. See the full Blackish swatch →